Loans, Lending Commitments and Related Allowance for Credit Losses - Loans by Interest Rate Type (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	$ 61,846	$ 60,911
Floating or Adjustable Rate	241,777	218,315
Corporate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	86	1
Floating or Adjustable Rate	19,749	14,478
Secured lending facilities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	0	525
Floating or Adjustable Rate	75,457	70,440
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	331	327
Floating or Adjustable Rate	7,726	8,032
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	33,088	32,377
Floating or Adjustable Rate	42,544	40,031
Securities-based lending and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed Rate	28,341	27,681
Floating or Adjustable Rate	$ 96,301	$ 85,334